LibJS: Reorganize tests into subfolders

Author: https://github.com/mattco98
Commit: 4c48c9d69d
Pull-request: https://github.com/SerenityOS/serenity/pull/2681
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/builtins/Math/Math.max.js

@@ -0,0 +1,15 @@
+load("test-common.js");
+
+try {
+    assert(Math.max.length === 2);
+    assert(Math.max() === -Infinity);
+    assert(Math.max(1) === 1);
+    assert(Math.max(2, 1) === 2);
+    assert(Math.max(1, 2, 3) === 3);
+    assert(isNaN(Math.max(NaN)));
+    assert(isNaN(Math.max("String", 1)));
+
+    console.log("PASS");
+} catch {
+    console.log("FAIL");
+}